Book binding device



FIG. 1 is a front perspective view of the book binding device accordingto the present invention;

FIG. 2 is a rear perspective view of the book binding device;

FIG. 3 is a left side perspective view of the book binding device;

FIG. 4 is a right side perspective view of the book binding device;

FIG. 5 is a bottom perspective view of the book binding device;

FIG. 6 is a top perspective view of the book binding device; and,

FIG. 7 is a front-side perspective view of the book binding device.

The ornamental design for a book binding device, as shown and described.